C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
400/7509
C08K 5/10 (2006.01) C08L 69/00 (2006.01)
Patent
CA 1122341
8CH-2277 ABSTRACT OF THE DISCLOSURE A thermoplastic molding composition of improved thermal discoloration stability using selected ester mold release agents, the composition comprising: (1) an aromatic carbonate polymer prepared by react- ing (i) one or more dihydric phenols or a copolymer thereof with a glycol or a hydroxy or acid terminated polyester and (ii) a carbonate precursor selected from among the group consisting of a carbonyl halide, a carbonate ester, a haloformate, polymeric derivative of a dihydric phenol, a dicarboxylic acid and carboxylic acid, and (2) from 0.1 to 3.0 weight percent based on the weight of the polycarbonate composition, of an ester of an acid selected from saturated aliphatic monocarboxylic and dicarboxylic acids of the following formulae: (a) CnH2n+1 - COOH, and (b) HOOC - CnH2n - COOH where n is from about 5 to about 34 and mixtures thereof, with an alcohol having no hydrogen atoms on any carbon beta to the hydroxy group and being selected from the following general formulae: (c) Image (d) Image wherein R3 and R5 are independently alkyl and substituted alkyl of 1 to 4 carbon atoms and R4 is alkylene of 1 to 4 carbon atoms or -(CH2)a-0-(CH2)a- wherein a is an integer from 1 to 4 and mixtures thereof.
284665
Company General Electric
Eckersley Raymond A.
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